Pleistocene glacial history of the New Zealand subantarctic islands

Authors

Eleanor Rainsley, University of WollongongFollow
Christian Turney, University of Wollongong, University of New South WalesFollow
Nicholas Golledge, Victoria University of Wellington
Janet M. Wilmshurst, Landcare Research NZ
Matt S. McGlone, Landcare Research NZ
Alan Hogg, University of Waikato
Bo Li, University of WollongongFollow
Zoë Thomas, University of New South Wales
Richard G. Roberts, University of WollongongFollow
Richard T. Jones, University of Exeter
Jonathan G. Palmer, University of New South WalesFollow
Verity Flett, University of Dundee
Gregory De Wet, University of Colorado
David Hutchinson, Stockholm University
Mathew Lipson, University of New South Wales
Pavla Fenwick, Gondwana Tree-Ring Laboratory
Ben Hines, Victoria University of Wellington
Umberto Binetti, University of East Anglia
Christopher Fogwill, University of New South Wales

RIS ID

134174

Publication Details

Rainsley, E., Turney, C. S.M., Golledge, N. R., Wilmshurst, J. M., McGlone, M. S., Hogg, A. G., Li, B., Thomas, Z. A., Roberts, R., Jones, R. T., Palmer, J. G., Flett, V., de Wet, G., Hutchinson, D. K., Lipson, M. J., Fenwick, P., Hines, B. R., Binetti, U. & Fogwill, C. J. (2019). Pleistocene glacial history of the New Zealand subantarctic islands. Climate of the Past, 15 (2), 423-448.

Abstract

The New Zealand subantarctic islands of Auckland and Campbell, situated between the subtropical front and the Antarctic Convergence in the Pacific sector of the Southern Ocean, provide valuable terrestrial records from a globally important climatic region. Whilst the islands show clear evidence of past glaciation, the timing and mechanisms behind Pleistocene environmental and climate changes remain uncertain. Here we present a multidisciplinary study of the islands-including marine and terrestrial geomorphological surveys, extensive analyses of sedimentary sequences, a comprehensive dating programme, and glacier flow line modelling-to investigate multiple phases of glaciation across the islands. We find evidence that the Auckland Islands hosted a small ice cap 384 000±26 000 years ago (384±26 ka), most likely during Marine Isotope Stage 10, a period when the subtropical front was reportedly north of its present-day latitude by several degrees, and consistent with hemispheric-wide glacial expansion. Flow line modelling constrained by field evidence suggests a more restricted glacial period prior to the LGM that formed substantial valley glaciers on the Campbell and Auckland Islands around 72-62 ka. Despite previous interpretations that suggest the maximum glacial extent occurred in the form of valley glaciation at the Last Glacial Maximum (LGM; ∼ 21 ka), our combined approach suggests minimal LGM glaciation across the New Zealand subantarctic islands and that no glaciers were present during the Antarctic Cold Reversal (ACR; ∼ 15-13 ka). Instead, modelling implies that despite a regional mean annual air temperature depression of ∼ 5 °C during the LGM, a combination of high seasonality and low precipitation left the islands incapable of sustaining significant glaciation. We suggest that northwards expansion of winter sea ice during the LGM and subsequent ACR led to precipitation starvation across the middle to high latitudes of the Southern Ocean, resulting in restricted glaciation of the subantarctic islands.